______, they couldn’t solve the mystery.
| A．Tried hard as they | B．Hard as they tried | C．Tried as they hard | D．They tried hard as |
On the small island, which is the entrance to New York Harbor, _______.
| A．the Statue of Liberty stands |
| B．stands the Statue of Liberty |
| C．does the Statue of Liberty stand |
| D．is the Statue of Liberty standing |
---I hear Liza and her husband have flown to Hawaii for their honeymoon．
---Oh, how nice! Do you know when they?
| A．were leaving | B．had left | C．have left | D．left |
Be careful when you deal with this chemical, as it will explode when ______ to sunlight.
| A．exposed | B．to expose | C．exposing | D．being exposed |
Normally, a forest fire and the damage ______ causes can be very severe, especially when you consider the financial and physical losses.
| A．which | B．it | C．this | D．that |
---Sunday is a public holiday, _____children should get close to nature.
---But most of them have several lessons to attend.
| A．when | B．which | C．where | D．what |